Karst regions
The major karst areas of North America and what lives in them
Subterranean fauna follows rock rather than borders. A karst region is often the more meaningful unit: species are shared along a limestone belt in ways they are not shared across a state line.
Appalachians
325 species
210 ranked G1 or G2
Black Hills
2 species
1 ranked G1 or G2
Driftless Area
13 species
5 ranked G1 or G2
Edwards Plateau and Balcones
252 species
147 ranked G1 or G2
Florida Lime Sinks
33 species
30 ranked G1 or G2
Guadalupe Mountains
16 species
12 ranked G1 or G2
Hawaii
60 species
44 ranked G1 or G2
Interior Low Plateau
438 species
288 ranked G1 or G2
Mother Lode
27 species
23 ranked G1 or G2
Other
303 species
164 ranked G1 or G2
Ozarks
118 species
46 ranked G1 or G2
Many species are recorded from more than one region, so these counts add up to more than the total number of species.